Westermo MA-21 User Manual
Strömslingeomvandlare
Current Loop Converter
Stromschleifenwandler
INSTALLATIONSANVISNING
INSTALLATION MANUAL
INSTALLATIONS ANLEITUNG
6021-2002
www.westermo.se
MA-21 AC
MA-21 DC
©
Westermo Teleindustri AB • 1998 • REV. A
Galvanic
Isolation
Transient
Protection
Balanced
TransmissionCEApproved
8 6021-2002
Switch settings
The MA-21 can through different switch settings be adapted to a vareity of running
conditions. To set the switches, open the plastic case by placing and turning a screwdriver between top and bottom at the rear of the case.
DANGER! DO NOT OPEN CONNECTED UNIT
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V.24/RS-232-C
CONNECTION
LINE
CONNECTION
MAINS
Specifications
Transmission Asynchronous, full/half duplex or simplex
Interface 1 EIA RS-232-C/CCITT V.24
25-position D-sub female, DCE
Interface 2 20 mA current loop, selectable active or passive
Data rate Up to 19.2 bit/s
Indicators Power, RD, TD
Isolation Galvanic isolation with opto-coupler (data transmission)
and transformer (supply)
Isolation voltage 1500V
Overvoltage protection Mains: Breakdown voltage 440V at 230V AC
and 220V at 115V AC
Interface 2: Breakdown voltage transmitter
and receiver 37V
Surge capacity 0.6 kW for 1ms
Power supply Switchable 115/230V +15/ –10% 48–62Hz
Fuse 100mA fast 5x20 mm
Power consumption Max 5VA at 230V AC
Temperature range 5–50°C, ambient temperature
Humidity 0–95% RH, non-condensing
Dimensions WxHxD 161x53x139 mm
Weight 0.5 kg
Mounting With rubber pads or screws. Screws: remove
the two "keyholes" on the bottom of the case
96021-2002
ON
OFF
S4
1 - 6
ON
OFF
S5 S1
1 - 91 - 6 1 - 4
S2S3
S1 Selection of transmitted signal, selection
of signal controlling CTS
S2 Selection of transmitter/receiver
normal or inverted
S3 Selection of receiver active/passive
S4 Selection of transmitter active/passive
S5 Selection of power supply
115/230V AC
Receiver active/passive
Factory settings
S3
S3
ON
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ON
123456
Transmitter active/passive
Passive
S4
Active
S4
ON
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ON
123456
Passive
Transmitted signal
Active
ON
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TD
S1
ON
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S1
ON
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AUX
S1
ON
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SRS
S1
ON
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DTR
S1
CTS controlled by
ON
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RTS
S1
ON
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RD
S1
ON
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Always high
S1
Inverted Transmitter/Receiver
Transmitter
Normal Normal
Normal
Inverted
Inverted
Inverted
Normal
Inverted
Receiver
S2
S2
S2
S2
ON
1234
ON
1234
ON
1234
ON
1234
S2
ON
1234
S3
ON
123456
S4
ON
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